Fixes and move to jvmDemo (#286)

orx-shapes/src/jvmDemo/kotlin/DemoBezierPatches01.kt

@@ -0,0 +1,38 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extensions.SingleScreenshot
+import org.openrndr.extra.shapes.bezierPatch
+import org.openrndr.shape.Circle
+import org.openrndr.shape.ShapeContour
+import org.openrndr.extra.shapes.drawers.bezierPatch
+import org.openrndr.extra.shapes.drawers.bezierPatches
+
+/**
+ * Shows how to create a [bezierPatch] out of a
+ * closed [ShapeContour] with 4 curved segments.
+ *
+ * Calling [Circle.contour] is one way of producing
+ * such a contour with vertices at the cardinal points
+ * but one can manually create any other 4-segment closed contour
+ * to use in bezier patches.
+ */
+fun main() {
+    application {
+        configure {
+            width = 800
+            height = 800
+        }
+        program {
+            val c0 = Circle(width / 3.0, height / 2.0, 150.0).contour
+            val bp0 = bezierPatch(c0)
+
+            val c1 = Circle(2.0*width / 3.0, height / 2.0, 150.0).contour
+            val bp1 = bezierPatch(c1)
+
+
+            extend {
+                drawer.bezierPatches(listOf(bp0, bp1))
+            }
+        }
+    }
+}